Meaning of “gear (sb/sth) up” - Learner’s Dictionary

gear (sb/sth) up

phrasal verb with gear uk us /ɡɪər/ verb

to prepare for something that you have to do, or to prepare someone else for something:

[ often reflexive ] I'm trying to gear myself up for the exams.

(Definition of “gear (sb/sth) up” from the Cambridge Learner’s Dictionary © Cambridge University Press)